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  <title>Change current storage handler</title>
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  <div id="layout-content"><div id="function.mysqlnd-qc-set-storage-handler" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mysqlnd_qc_set_storage_handler</h1>
  <p class="verinfo">(PECL mysqlnd_qc &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">mysqlnd_qc_set_storage_handler</span> &mdash; <span class="dc-title">Change current storage handler</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.mysqlnd-qc-set-storage-handler-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   
   <span class="methodname"><strong>mysqlnd_qc_set_storage_handler</strong></span>
    ( <span class="methodparam">
    <span class="type">string</span>
     <code class="parameter">$handler</code>
   </span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Sets the storage handler used by the query cache. A list of available
   storage handler can be obtained from
   <span class="function"><a href="mysqlnd_qc_get_available_handlers.html" class="function">mysqlnd_qc_get_available_handlers()</a></span>.
   Which storage are available depends on the compile time
   configuration of the query cache plugin. The
   <em>default</em> storage handler is always available.
   All other storage handler must be enabled explicitly when building the
   extension.
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-function.mysqlnd-qc-set-storage-handler-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>

     <code class="parameter">handler</code>
    </dt>

    <dd>

     <p class="para">
      Handler can be of type string representing the name of a
      built-in storage handler or an object of type
      <em>mysqlnd_qc_handler_default</em>.
      The names of the built-in storage handler are
      <em>default</em>,
      <em>APC</em>,
      <em>MEMCACHE</em>,
      <em>sqlite</em>.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mysqlnd-qc-set-storage-handler-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
  <p class="para">
   If changing the storage handler fails a catchable fatal error will
   be thrown. The query cache cannot operate if the previous storage
   handler has been shutdown but no new storage handler has been installed.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.mysqlnd-qc-set-storage-handler-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-2301">
   <p><strong>Example #1 <span class="function"><strong>mysqlnd_qc_set_storage_handler()</strong></span> example</strong></p>
   <div class="example-contents"><p>
    The example shows the output from the built-in default storage handler.
    Other storage handler may report different data.
   </p></div>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">mysqlnd_qc_set_storage_handler</span><span style="color: #007700">(</span><span style="color: #DD0000">"memcache"</span><span style="color: #007700">));<br /><br />if&nbsp;(</span><span style="color: #0000BB">true&nbsp;</span><span style="color: #007700">===&nbsp;</span><span style="color: #0000BB">mysqlnd_qc_set_storage_handler</span><span style="color: #007700">(</span><span style="color: #DD0000">"default"</span><span style="color: #007700">))<br />&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Default&nbsp;storage&nbsp;handler&nbsp;activated"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Catchable&nbsp;fatal&nbsp;error&nbsp;*/<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">mysqlnd_qc_set_storage_handler</span><span style="color: #007700">(</span><span style="color: #DD0000">"unknown"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

   <div class="example-contents"><p>以上例程会输出：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
bool(true)
Default storage handler activated
Catchable fatal error: mysqlnd_qc_set_storage_handler(): Unknown handler &#039;unknown&#039; in (file) on line (line)

</pre></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mysqlnd-qc-set-storage-handler-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member">
     <a href="mysqlnd_qc.installation.html" class="link">Installation</a>
    </li>
    <li class="member">
     <span class="function"><a href="mysqlnd_qc_get_available_handlers.html" class="function" rel="rdfs-seeAlso">mysqlnd_qc_get_available_handlers()</a> - Returns a list of available storage handler</span>
    </li>
   </ul>
  </p>
 </div>



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